12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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